Why spend the money on store-bought disposer-cleaning capsules when baking soda works just as well? First, run the unit with plain water to clear any gunk. Then, put in the stopper and fill the sink halfway with warm water. Add 1/4 cup of baking soda.
Now remove the stopper as you flip on the disposer's switch. Toss in some lemon or orange peels as the water swirls down, and switch off the disposer when the water runs out.